Inductance-coil control



April 20 1926. 1,581,366

G. A. TURNER 'INDUC'iANCE COIL CONTROL Filed Sept. 26, 1923 TTORNEYlatented Apr. 20, 1926.

UNITED STATES GEORGE A. TURNER, OF STOCKTON, CALIFORNIA.

INDUGTANCE-COIL common Application filed September 26, 1923. Serial No.664,862.

To all whom 2'25 may concern:

Be it known that I, GEORGE A. TURNER, a citizen of the United States,residing at Stockton, county of San Joaquin, State of California, haveinvented certain new and useful Improvements in Inductance-CoilControls; and I do declare the following to be a full, clear, and exactdescription of the same, reference being had to the accompanyingdrawings, and to the characters of reference marked thereon, which forma part of this application.

This invention relates to improvements in radio receiving sets, andparticularly to the mounting of the inductance coils and the means formoving them to and from each other for the well known purpose of placingthem in harmonized or desired inductive relation to the different wavelengths used by various stations when broadcasting.

I have made no attempt to change in any way the functional operation ofthe coils or any other mechanism of a radio set, the main objects of myinvention being to provide means for enabling the coils to be moved toand from each other while maintaining a parallel relation, and in such amanner that much finer adjustments of the coils may be made, and withless efiort, than can be done with the adjustment means at present used.

My adjusting means also permits of the enclosing of the coils where theyare out of the way of possible damage being done them by coming incontact with foreign objects, as well as being protected from dust ordirt and dampness, and a much neater arrangement of the set as a wholecan be had than when the coils are out in the open, as they are and mustbe with present forms of construction.

I also believe that by moving the coils so that they always remainparallel to each other more efficient results will be obtained than areat present had.

A further object of the invention is to produce a simple and inexpensivedevice and yet one which will be exceedingly effective for the purposesfor which it is designed.

These objects I accomplish by means of such structure and relativearrangement of parts as will fully appear by a perusal of the followingspecification and claim.

In the drawings similar characters of reference indicate correspondingparts in the several views:

llig. l is a perspective view of a tuning unit, looking at the back orinner side.

Flg. 2 is a vertical section through the same.

Referring now more particularly to the characters of reference on thedrawings, the numeral 1 denotes a panel, made of the usual insulationmaterial.

Mounted on one side of the panel are horizontal and vertically spacedguide bars 2 and 3, the lower bar 3 being arranged for limited verticaladjustment as indicated.

A fixed block 4 mounted centrally of the length of the guides andtherebetween is arranged to serve as a support and to removably receivea standard inductance tuning coil 5 of the honeycomb or similar type.

Blocks 6 similar to the block 4: are slidably mounted between andsupported by the guides on each side of the block 4, these blocks beingalso designed and arranged to removably support other standard tuningcoils 7, the three coils forming a unit, and being mounted to be inalinement with and parallel to each other.

Flexible leads 8 extend from binding posts 9 on the panel to posts 10 onthe blocks 6, so that horizontal movement of the latter, to and from thefixed block 4, may be had without straining the leads.

Such movement is imparted to the blocks 6, and consequently to the coils7 in the following manner: Horizontal and independent racks 11 ofsuitable length are mounted on the blocks 6 beyond or outwardly of theupper guide bar 2. Meshing with each rack is a pinion 12 fixed on a stem13 turnably mounted in the upper guide and panel and projecting throughthe latter to a connection with a knob 14: by which said stem and pinionmay be turned. A finger 15 is provided with the knob, which registerswith each suitable dial marks of ordinary character (not shown) on theouter face of the panel.

WVhen assembled as a complete outfit, the panel forms the face of acasing into which the coils and the accompanying mechanism projects andin which they are concealed and enclosed.

In operation, it will be seen that by the turning of either knob, thecorresponding coil is caused to move to or from the fixed coil 5, theparallel relation of the coils being maintained irrespective of theposition of the coils. Further, the mechanism employed for thus movingthe coils enables the amount of such movement to be very accurately andclosely regulated.

Should the movable blocks, due to wear, have undue freedom of movementbetween the guides, the lower one 3 of the latter may be moved up totake up the slack.

From the foregoing description it will be readily seen that I haveproduced such a device as substantially fulfills the objects of'theinvention as set forth herein, 7

While this specification sets forth in detail the present and preferredconstruction of the device, still in practice such deviations from suchdetail may be resorted to as do not form a departure from the spirit ofthe invention, as defined by the appended claim.

Having thus described my invention what I claim as new and useful anddesire to secure by Letters Patent is:

An inductance coil control mechanism including a supporting panel, apair of spaced guide bars on one face of the panel, a block fixedcentrally between the guide bars, a block on each side of the fixedblock slidably mounted in the guide bars for movement toward or from thefixed block in constant parallel relation with respect to each other, agear rack on each slidable block, a gear engaging each rack means forturning the gears to operate the racks and slide the blocks, the blockshaving free ends projecting clear of the guide bars, and means forremovably attachin an inductance coil on the free end of each block.

In testimony whereof I afiiX my signature.

GEORGE A. TURNER.

